Trombetta Zannin, Paulo Henrique; Engel, Margret Sibylle; Kirrian Fiedler, Paulo Eduardo; Bunn, Fernando (2013). "Characterization of environmental noise based on noise measurements, noise mapping and interviews: A case study at a university campus in Brazil". Cities. 31. Elsevier: 317–327. doi:10.1016/j.cities.2012.09.008.